Relief-valve for pumps



B. E CANNON.

RELIEF VALVE FOR PUMPS.

APPLICATION FILED MAR. 31. 1916.

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gwuevl/toz 6/ BERNARD E. CANNON, OF LOCUST GAP, PENNSYLVANIA.

RELIEF-VALVE FOR PUMPS.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed March 31, 1916. Serial No. 87,901.

T 0 all whom it may concern:

Be it known that I BERNARD E. CANNON, a citizen of the United States,and a resident of Locust Gap, in the county of Northumberland and Stateof Pennsylvania, have invented certain new and useful Improvements inRelief-Valves for Pumps, of which the following is a specification.

This invention relates to an improvement in relief valves for pumps.

The object of the invention is the pr0- duction of means whereby theflow through the suction pipe of a pump is not stopped with the closureof the suction valves of the pump.

Heretofore suction air chambers have been used to maintain aninterrupted flow in the suction pipe of a pump. With said air chambersshocks are produced upon the reversals of the stroke of the pump,because the air in said suction air chambers is soon absorbed by thefluid pumped, and the flow on the suction side is intermittently stoppedwithout resilient means to meet the inflowing column of water when thesuction valves are closed.

The present invention enables the practically uninterrupted flow offluid in the suction pipe of the pump. Its organization comprises achamber with a valve therein, which covers a port connecting with thesuction pipe. The said valve opens when the suction valves close andthereby allows the continuous flow of the suction column.

In the accompanying drawings Figure 1 shows the water end of the pumpwith the invention attached thereto; Fig. 2 represents a vertical axialsection of the invention and Fig. 3 is in part a top plan view and inpart a section as on the line 3, 3 of Fig. 2.

The water cylinders of a pump are indicated at 20 with the suctionchambers 21 having suction valves not shown, outlet chambers 22 withdischarge valves not shown and the discharge pipe 23. Reciprocatingpistons not shown are provided for the cylinders 20. A suction pipe 25is connected to the inlets of the suction chambers 21 and has anextended portion 25 which extends beyond the said suction chambers. Anelbow 28 at one end of the suction pipe 25 supports the overflow chamber30, which latter has formed therewith the inlet port 31 and the outletport 32. A bonnet 33 is bolted to the top of the chamber 30. Overflowpiping 34 extends from the outlet port 32. The piping 34 preferablyleads to a reservoir not shown from which the suction pipe 25 draws itscharge, or it may lead to a tank placed at a height so that the chargewill flow therein by reason of the momentum given to the charge when itenters the chamber 30. A valve seat 35, with the hub 36 and arms 37 issecured to the chamber 30, and carries the valve spindle 39 having thehead 40. A metallic cap 41 with the upper sleeve 42 and the lower sleeve43 en circles the valve spindle 39.

A check valve 45 preferably of rubber is normally located upon the valveseat 35, encircles the sleeve 43, and has bearing thereon the cap 41. Aspring 46 encircles the spindle 39 and sleeve 42 and bears between thecap 41 and the head 40 of the valve spindle 39. I It will be noted thatthe chamber 30 with its valve 45 is beyond the suction chambers 21, sothat the water in the chamber 30 will not work against the head in thedischarge pipe 23.

When the strokes of the piston in the water cylinders open the suctionvalves of the pump, a partial vacuum is produced in the suction pipe 25in the usual way, and the fluid column flows therein in the direction ofthe arrow A. When the suction valves close the column of water in thesaid suction pipe 25 still continues to flow in the same direction.During the short interval of time that the suction valves are closed.the inflowing fluid raises the valve 45, enters the chamber 30 and iseventually discharged through the piping 34. As soon as the suctionvalves close, the valve 45 is automatically opened, and the column ofwater in the chamber 30 seals the said valve 45, to preserve the vacuumin the suction pipe 25. The sleeve 43 prevents wear between the valve 45and the valve spindle 39.

It will be noted that a continuous flow of water is drawn into thesuction pipe 25 while the suction valves in suction chambers 21 areoperating. The water that is not forced through the ports of the suctionvalves of the chambers 21 flows into the overflow chamber 30. By reasonof this overflow and complete avoidance of interruption of the flow ofwater in the pipe 25 water hammer is avoided and great speed of the pumppistons is enabled to be ob tained.

Having described my invention what I desire to secure by Letters Patentand claim is:

l. The combination with a reciprocating piston pump of a suction conduitconnected to the suction end of the pump, a chamber for the overflow ofthe suction conduit having an inlet and an outlet the inlet of the saidchamber connected to the said suction conduit and a valve in saidchamber automatically opening with the flow in the suction conduit whenthe pump tends to interrupt such flow.

The combination With a reciprocating piston nump of a suction pipeconnected to the inlet opening of the pump and having 15 anextendedportion beyond said inlet opening, an overflow chamber having aninlet port and an outlet port, said inlet port connected to saidextended portion of the suction'pipe and a check valve in the overflow20 chamber for the inlet port thereof.

Signed at Locust Gap in the county of N orthumberland and State ofPennsylvania

